IADR Abstract Archives
Shear Bond Strength of Antibacterial Nanofilled Dental Adhesive Resins
Objectives: The incorporation of metaloxide nanoparticles into current polymer compositions has been demonstrated to improve the antibacterial and bioactive properties of commercially available dental adhesive resins. However, studies assessing the shear bond strength (SBS) of these experimental materials are not available. The objective of this study was to test the hypothesis that incorporation of nitrogen-doped titanium dioxide nanoparticles (N_TiO2) does not adversely impact the shear bond strength of a commercial adhesive resin.
Methods: Extracted human molars (n=110) were selected and longitudinally sectioned (diamond saw, Model 650, South Bay Technology, Inc., U.S.A.) under copious water irrigation to expose dentinal tissues. Tooth sections were embedded into acrylic blocks and wet-polished (up to 600-grit SiC). Two unaltered (OptiBond Solo Plus [OSP] and Clearfill SE Protect [CSE]) and eight experimental adhesive resins containing nanoparticles (N_TiO2 as-synthesized or surface-modified by APTES; 10-40% [v/v], 10% increments; Oak Ridge National Laboratory) were individually used (n=10/group) to bond cylindrical specimens (h=2.67mm, d=2.38mm) of Tetric EvoCeram (Ivoclar Vivadent, Inc., U.S.A.) to unetched dentinal tissues. Unaltered and experimental adhesive resins were polymerized (20s/each; top irradiation) using an LED light curing unit (BluePhase G4, U.S.A) according to manufacturers’ instructions. Specimens were stored in RO water (37°C, 24h) in preparation for SBS. A dynamic testing machine (ElectroPuls E3000, U.S.A.) was used (crosshead speed=0.5mm/min) to assess SBS of materials investigated. Experimental data was statistically analyzed using ANOVA and post-hoc Tukey tests (α=0.05).
Results: Mean values of SBS ranged from 15.98 MPa (40% APTES-modified N_TiO2) to 19.74 MPa (CSE). No statistically significant differences in mean SBS values were observed (p>0.05) for all materials investigated.
Conclusions: The incorporation of antibacterial N_TiO2 into a commercially available dental adhesive resin did not adversely impact SBS when tested on unetched dentin. Nanoparticles’ surface modification (APTES) and nanoparticles’ concentration were observed to not influence results reported.
Methods: Extracted human molars (n=110) were selected and longitudinally sectioned (diamond saw, Model 650, South Bay Technology, Inc., U.S.A.) under copious water irrigation to expose dentinal tissues. Tooth sections were embedded into acrylic blocks and wet-polished (up to 600-grit SiC). Two unaltered (OptiBond Solo Plus [OSP] and Clearfill SE Protect [CSE]) and eight experimental adhesive resins containing nanoparticles (N_TiO2 as-synthesized or surface-modified by APTES; 10-40% [v/v], 10% increments; Oak Ridge National Laboratory) were individually used (n=10/group) to bond cylindrical specimens (h=2.67mm, d=2.38mm) of Tetric EvoCeram (Ivoclar Vivadent, Inc., U.S.A.) to unetched dentinal tissues. Unaltered and experimental adhesive resins were polymerized (20s/each; top irradiation) using an LED light curing unit (BluePhase G4, U.S.A) according to manufacturers’ instructions. Specimens were stored in RO water (37°C, 24h) in preparation for SBS. A dynamic testing machine (ElectroPuls E3000, U.S.A.) was used (crosshead speed=0.5mm/min) to assess SBS of materials investigated. Experimental data was statistically analyzed using ANOVA and post-hoc Tukey tests (α=0.05).
Results: Mean values of SBS ranged from 15.98 MPa (40% APTES-modified N_TiO2) to 19.74 MPa (CSE). No statistically significant differences in mean SBS values were observed (p>0.05) for all materials investigated.
Conclusions: The incorporation of antibacterial N_TiO2 into a commercially available dental adhesive resin did not adversely impact SBS when tested on unetched dentin. Nanoparticles’ surface modification (APTES) and nanoparticles’ concentration were observed to not influence results reported.